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Livestock
Livestock & Forage
Lifetime ewe cull rates
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<blockquote data-quote="Global ovine" data-source="post: 8033865" data-attributes="member: 493"><p>After a quick look through annual land class data of sheep and beef farms in NZ for "Deaths, killed and missing" (as identified in business Annual Returns) the quoted paper seems much higher than any individual farms I have had data access to. This quoted report is from North Island Hard Hill Country (I do not know if it is in a Facial Eczema region, which can have devastating affects on deaths).</p><p></p><p>The nearest is South Island High (Mountain) and Hard Hill Country. Predominately Merinos and their derivatives averaging 5.2 - 7.1% pa. </p><p>NOTE: all figures involved; lambs tailed, sales, replacement and breeding stock present at commencement and end of the financial year.</p><p> The average size dog team on these larger grazing properties (pets included) is 0.8 dogs per 1000 sheep stock units. Therefore at least 200 sheep (old rams, thin ewes, non saleable sheep) would be slaughtered for dog tucker. Then there is house mutton. A 20,000 SSU property would support about 3 households, so at least 75 muttons would be slaughtered. The largest loss of sheep here is either Johnnes Disease in young ewes or pneumonia in old ewes , but only on some farms. Ewes are generally sold down country after 4 lambings.</p><p></p><p>South Island Improved Hill Country. Largely Romney or Romney derivatives.</p><p>3.7 - 5.3% pa. Note; average sheep flock 5670 SSU. Despite non shepherded lambing being the norm, losses at lambing time have been recorded as around 2% (prelamb shearing/or crutching tallies less those ewes present at tail docking).</p><p></p><p>South Island Intensive lowland Rolling. Largely Romney/Romney derivative/Composite.</p><p>3.1 - 5.0% pa. Deaths are of a similar profile to above, as more disease based deaths are encountered due to high stocking rates. Ewes are inspected at least once a day at lambing.</p><p>Most of these flocks are single operator flocks averaging 3820 SSU.</p><p></p><p>So in a 4500 ewe "average" South Island flock, ewes entering the flock as 2 tooths and kept for 6 lambings, about 25-28% would not survive to complete those 6 lambings. However there is much variability in the individual data.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 8033865, member: 493"] After a quick look through annual land class data of sheep and beef farms in NZ for "Deaths, killed and missing" (as identified in business Annual Returns) the quoted paper seems much higher than any individual farms I have had data access to. This quoted report is from North Island Hard Hill Country (I do not know if it is in a Facial Eczema region, which can have devastating affects on deaths). The nearest is South Island High (Mountain) and Hard Hill Country. Predominately Merinos and their derivatives averaging 5.2 - 7.1% pa. NOTE: all figures involved; lambs tailed, sales, replacement and breeding stock present at commencement and end of the financial year. The average size dog team on these larger grazing properties (pets included) is 0.8 dogs per 1000 sheep stock units. Therefore at least 200 sheep (old rams, thin ewes, non saleable sheep) would be slaughtered for dog tucker. Then there is house mutton. A 20,000 SSU property would support about 3 households, so at least 75 muttons would be slaughtered. The largest loss of sheep here is either Johnnes Disease in young ewes or pneumonia in old ewes , but only on some farms. Ewes are generally sold down country after 4 lambings. South Island Improved Hill Country. Largely Romney or Romney derivatives. 3.7 - 5.3% pa. Note; average sheep flock 5670 SSU. Despite non shepherded lambing being the norm, losses at lambing time have been recorded as around 2% (prelamb shearing/or crutching tallies less those ewes present at tail docking). South Island Intensive lowland Rolling. Largely Romney/Romney derivative/Composite. 3.1 - 5.0% pa. Deaths are of a similar profile to above, as more disease based deaths are encountered due to high stocking rates. Ewes are inspected at least once a day at lambing. Most of these flocks are single operator flocks averaging 3820 SSU. So in a 4500 ewe "average" South Island flock, ewes entering the flock as 2 tooths and kept for 6 lambings, about 25-28% would not survive to complete those 6 lambings. However there is much variability in the individual data. [/QUOTE]
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